OCR GCSE Twenty First Century Science Physics B Electric ... · Web viewTitle OCR GCSE Twenty First Century Science Physics B Electric Circuits Delivery Guide Author OCR Keywords
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Learner Resource
Ammeters and Voltmeters; why do we put them where we put them?
IntroductionWe have now seen several examples of the use of ammeters and voltmeters, and we can see that voltmeters always go in parallel and ammeters always go in series. Why?
Clue: how do components in series and in parallel affect the voltage and current in a circuit?
Activity Learners should be encouraged to ask why we cannot measure amps in parallel or volts in series, and how we can measure either without noticeably affecting the circuit. In some cases, the word ‘noticeably’ might be important. Knowledge of how voltage and current are affected by components in series and in parallel should be brought in to the explanation.
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